Seat mounted drink holder



FIG. 1 is a top, front, right side perspective view of a seat mounted drink holder showing my new design;

FIG. 2 is a right side elevational view thereof, the cup and seat arm are shown in broken lines for illustrative purposes only and form no part of the claimed design; and,

FIG. 3 is a left side elevational view thereof. 

The ornamental design for a seat mounted drink holder, as shown and described. 